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【免费下载】精编天津市津南区东部学区20202021学年八年级下学期期中物理试题

  • 2026-01-16 16:54:15
【免费下载】精编天津市津南区东部学区20202021学年八年级下学期期中物理试题

学年天津市津南区东部学区八年级(下)期中

物理试卷

一、单选题(本大题共9小题,共25.0

二、分)

1. 如图所示的几种现象中,力所产生的作用效果与其它三个不一样的是(  )

A. 手拉开弓B. 运动员罚点球

C. 小明压弯跳板D. 熊猫拉弯竹子

2. 关于力的描述,下列说法正确的是(  )

A. 重力的方向总是垂直向下

B. 当物体处于静止状态时,压力等于重力

C. 水平方向匀速拉动的木块,摩擦力的大小可根据二力平衡原理测得

D. 弹簧只有在拉伸时才产生弹力,在压缩时是不产生弹力的

3. 如图所示,将系在细线下的小球拿至A点,然后由静止释放,小球将在AC两点之间往复摆动,如果不考虑空气对小球的阻力,下列分析中正确的是(  )

A. 小球在摆动过程中始终受到平衡力作用

B. 当小球摆至B点时,如果细线突然断裂,小球将竖直下落

C. 当小球摆至C点时,如果小球所受的力同时消失,小球将静止在C位置

D. 小球摆动过程中,随着小球位置的改变,小球所受重力的大小和方向也随之改变

4. 下列情景中描述正确的是(  )

A. 儿童鞋底有凹凸的花纹是为了减小摩擦

B. 笔弹起离开桌面继续上升是因为受到惯性的作用

C. 粽子对盘的压力和桌面对盘的支持力是一对平衡力

D. 商品从货物架放入购物车的过程中,商品的运动状态发生了改变

5. 王伟老师经常引导学生利用身边的生活用品做实验,通过动手动脑,学习物理知识,揭示物理规律.下面的实验(图)不是揭示流体压强与流速关系的实验是

A. B. C. D. 

6. 如图所示,用锤子将钉子钉入墙壁,下列说法中正确的是(  )

A. 锤头对钉子的作用力大于钉子对锤头的作用力

B. 钉子尖和钉子帽所受的压强相等

C. 钉子尖和钉子帽所受的压力相等

D. 钉子尖很尖是为了减小压强

7. 关于气体压强方面的物理知识,下列说法不正确的是(  )

A. 托里拆利实验可以测量大气压强的值

B. 马德堡半球实验可以证明大气压强的存在

C. 水的沸点在标准大气压下是100℃,随着大气压的减小,水的沸点也会降低

D. 大气压强随着高度的增加而增大

8. 某同学和家人在外出旅游途中,车抛锚在水平路面上,家人试图推动汽车但没有推动。下列说法中正确的是(  )

A. 推力等于车受到的摩擦力

B. 车未被推动是因为人推车的力小于车推人的力

C. 人对车的推力和车对人的推力是一对平衡力

D. 车受到的支持力和车的重力是一对相互作用力

9. 忽略空气阻力,抛出后的小球在空中运动轨迹如图所示,抛出后的小球由于

A. 不受力,运动状态发生改变

B. 不受力,运动状态不发生改变

C. 受到重力作用,运动状态发生改变

D. 受到推力作用,运动状态发生改变

二、填空题

10. 如图所示,用F6N水平向右的拉力匀速拉动物块A时,物块B静止不动,此时弹簧测力计的示数为4N。则物块B所受摩擦力的方向为______(填“水平向左”或“水平向右”),物块A受到地面的摩擦力的大小是______N

11. 如图1,表示体重大致相同的滑雪者和步行者在雪地里行走的情景,此情景说明压力相同时,受力面积越______压力的作用效果越明显;现利用海绵、小桌、砝码探究压力的作用效果与压力的关系,应选择图2中的______两图。

12. 快速向前行驶的公共汽车遇到紧急情况突然刹车时,乘客会向______(选填“前”或“后”)倾倒,这是乘客具有______的缘故。

13. 如图所示,瓶中的水从孔AB中流出,说明液体对容器的侧壁有压强,水的落点不同,说明液体的压强随________的增加而增加。船闸是利用________原理建造的。

14. 如图所示是测量大气压值的实验,那么最早测出大气压数值的科学家是_____。图中所测到的当时大气压强是_____mm水银柱所产生的压强。

15. 小船船底离水面0.5m,水对船底压强为______Pa;若船底有一面积为2dm2的小洞被一木塞堵住,水对该木塞的压力为______Ng10N/kg)。

四、实验探究题(本大题共4小题,共23.0分)

16. 如图是小明用弹簧测力计、木块、砝码、长木板、毛巾,探究“影响滑动摩擦力大小因素”的实验。

1)拉着木块在木板上做匀速直线运动时,弹簧测力计的示数如图甲所示,则木块受到的滑动摩擦力大小为______N

2)图甲、乙两次实验要研究的是滑动摩擦力大小与______的关系;

3)在进行图丙的实验时,小明发现当弹簧测力计示数达到最大值时仍没拉动木块。为了使用现有实验器材顺利完成此探究,你可建议小明采取______的办法,测出滑动摩擦力的大小,再和图中______(填“甲”或“乙”)进行比较,来完成探究滑动摩擦力与接触面粗糙程度的关系实验。

17. 某同学用如图所示的装置探究阻力对物体运动的影响。实验时,先后让小车以相同的速度分别在毛巾、棉布和木板表面上运动,测出小车运动的最大距离,结果记录在下表中。

接触面

小车运动的距离s/(单位:cm)

毛巾

18.00

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  1. CONNECT:[ UseTime:0.000966s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001616s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003767s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002842s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001328s ]
  6. SELECT * FROM `set` [ RunTime:0.004291s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001429s ]
  8. SELECT * FROM `article` WHERE `id` = 461493 LIMIT 1 [ RunTime:0.007878s ]
  9. UPDATE `article` SET `lasttime` = 1768557084 WHERE `id` = 461493 [ RunTime:0.008422s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000589s ]
  11. SELECT * FROM `article` WHERE `id` < 461493 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001024s ]
  12. SELECT * FROM `article` WHERE `id` > 461493 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006795s ]
  13. SELECT * FROM `article` WHERE `id` < 461493 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.030795s ]
  14. SELECT * FROM `article` WHERE `id` < 461493 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.036017s ]
  15. SELECT * FROM `article` WHERE `id` < 461493 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.041213s ]
0.245787s